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  <title>获取密码iv长度</title>
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  <div id="layout-content"><div id="function.openssl-cipher-iv-length" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">openssl_cipher_iv_length</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.3.3, PHP 7)</p><p class="refpurpose"><span class="refname">openssl_cipher_iv_length</span> &mdash; <span class="dc-title">获取密码iv长度</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-function.openssl-cipher-iv-length-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="methodname"><strong>openssl_cipher_iv_length</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$method</code></span>
   ) : <span class="type">int</span></div>

  <p class="para rdfs-comment">
   获取密码初始化向量(iv)长度。
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.openssl-cipher-iv-length-parameters">
  <h3 class="title">参数</h3>
  <dl>

   
    <dt>
<code class="parameter">method</code></dt>

    <dd>

     <p class="para">
      密码的方法，更多值查看 <span class="function"><a href="openssl_get_cipher_methods.html" class="function">openssl_get_cipher_methods()</a></span> 函数。
     </p>
    </dd>

   
  </dl>

 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.openssl-cipher-iv-length-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功，返回密码长度, 失败返回 <strong><code>FALSE</code></strong> . 
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-function.openssl-cipher-iv-length-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   当密码方法未知时，抛出一个<strong><code>E_WARNING</code></strong> 级的错误。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.openssl-cipher-iv-length-examples">
  <h3 class="title">范例</h3>
  <div class="example" id="example-922">
   <p><strong>Example #1 <span class="function"><strong>openssl_cipher_iv_length()</strong></span> 范例</strong></p>
   <div class="example-contents">
<div class="phpcode"><pre><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$method&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'AES-128-CBC'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$ivlen&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #0000BB">openssl_cipher_iv_length</span><span style="color: #007700">(</span><span style="color: #0000BB">$method</span><span style="color: #007700">);<br /><br />echo&nbsp;</span><span style="color: #0000BB">$ivlen</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</pre></div>
   </div>

   <div class="example-contents"><p>以上例程的输出类似于：</p></div>
   <div class="example-contents screen">
<div class="cdata"><pre>
16
</pre></div>
   </div>
  </div>
 </div>


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